にがり (Nigari)

Okinawan and Seto Inland Sea salt traditions yield mineral-rich nigari with profile differences (Okinawan high-magnesium vs Seto balanced) prized by tofu artisans worldwide.
Magnesium chloride 60–95% (varies by source); pH 6.5–7.5; coagulation rate ideal 0.4–0.7% in soy milk for tofu.
Premium tofu coagulant for export, magnesium-fortified beverages, single-origin retail nigari.
Liquid bittern obtained as a by-product of seawater salt production. Primarily magnesium chloride (60–95%) with minor calcium and potassium. Indispensable as the coagulant for traditional Japanese tofu, and increasingly used as a magnesium-supply ingredient in hot-pot soups, beverages, and cosmetics. Domestic production is concentrated in Okinawa (Ishigaki, Miyako), the Seto Inland Sea (Ako, Kagawa), and Noto Peninsula. Mass-volume nigari for tofu manufacturing flows through cooperatives, while specialty single-origin nigari has emerged as a premium retail and wellness category.
| 日本 | Food additive (designated coagulant) for tofu under JAS |
|---|---|
| 欧盟 | Food additive E511 (magnesium chloride); CosIng listed (Magnesium Chloride) |
| 美国 | GRAS for food (food additive 21 CFR 184.1426); MoCRA cosmetic use |
| 中国 | GB 2760 food-additive register; verify import label compliance |
Ako Kasei Co., Ltd.
赤穂化成株式会社
Hyogo-based salt and mineral specialist founded 1947, in the historic Ako salt-production district. Vertically integrated from seawater intake through evaporation, crystallisation, and bittern (nigari) recovery. Operates the deep-sea-water plant in Muroto (Kōchi) and the Ako salt plant. Major B2B supplier of industrial salt, premium nigari for tofu and beverage applications, and mineral concentrates for cosmetic and supplement markets.
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Kanehide Bio Co., Ltd.
金秀バイオ株式会社
冲绳综合健康食品制造商(金秀集团旗下)。1998年成功从冲绳海蕴中提取岩藻多糖。持有日本专利第3408180号——高纯度岩藻多糖柠檬酸萃取技术。旗舰产品「冲绳岩藻多糖」于2024年累计销量突破80万件。同时生产三种冲绳姜黄品种相关产品。
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Noto Saltworks Co., Ltd.
奥能登塩田村
Heritage saltworks in Suzu (Noto Peninsula, Ishikawa) operating the traditional 'agehama' salt-making method designated as a UNESCO Globally Important Agricultural Heritage System. Hand-poured seawater on raked sand, sun-evaporated, then condensed in an iron pan over wood fire. The premium hand-made salt is sold to Japanese fine-dining restaurants and exported to Michelin-listed Western kitchens. A reference producer for export-grade artisanal Japanese sea salt.
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